bug#45834: 28.0.50; Mouse events in terminal emacs

[Lars Ingebrigtsen]

I was wrong about this being a regression since Emacs 26 (sort of) --
since enabling focus-in things in xterm.el, this apparently has been the
way it's worked.  Emacs 26 doesn't do the focus tracking.

So `xterm-translate-focus-in' does the correct thing in the normal
command loop, but not quite when doing a read_key_sequence?  I mean,
what it's doing is better than what it'd otherwise do -- then `C-h k' +
focus out would read the first ESC and then "[O" would be inserted into
the buffer.

Which is indeed what happens if you say (read-event "foo") and then
change focus.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no